I’ve been browsing, searching, reading regarding charging the Tesla based on available solar power, but there are many different topics on this subject and I don’t get a good overview of what is working good. Therefore this post and I hope the community can help.
Like many others I want to charge the Tesla based on available solar energy controlled by Home Assistant. What is good integration or what is a good automation script for this.
My situation:
Home Assistant installed and up and running,
Tesla integration installed and working perfectly,
Goodwe integration for solar power monitoring, working perfectly,
Car charger is a bit old and is from New Motion, no Home Assistant integration.
P1 meter installed and working perfectly. HA is monitoring the power consumption/production.
What I would like to achieve:
Car is plugged in into the New Motion charger, when the solar is generating above X watts, the car is being charged.
Switch to charge from solar or from grid (in case I need the car the next day).
Questions, challenges:
When I inserted the plug from the New Motion, the car start charging immediately. How can this be controlled if I want to charge from solar?
If the Tesla is instructed to change the charging current regularly and/of maybe even enabled/disabled (if there is no solar power), Would this damage the car, the batteries? How can this be prevented?
Looking forward to feedback and suggestions? Thanks for the support.
I have not done this but I believe its possible. A few thoughts. The Tesla integration provides a switch (switch.xxx_charger). I think that allows you to switch charging on/off. So you could trigger on power production if its greater than a defined value then turn charging on. And if power production goes low then turn charging off. There must be some intelligence though so that its not going on/off all the time. Potentially based on “min charge time”. You could have another switch so that you can manually switch charging on independently of power production.
I was also looking for a blueprint, and came accross this post.
Have you found or created something since you posted this thread?
I currently use a simple automation which enables charging and decreases the charge current at a certain level of returning solar power to the grid. I also enable a input boolean so I know I’m auto-charging. When the solar power is below a certain level for a certain period it disables the charging and resets the charge current, also disabling the auto-charge input boolean.
I don’t know if changing the current would affect the car or battery, but some public chargers also can change the current frequently, so I don’t think so.